1
Donald Jewkes, Volker Krueger: Integrated directional under-reamer and stabilizer. Baker Hughes Incorporated, Madan Mossman & Sriram P C, May 9, 2000: US06059051 (123 worldwide citation)

The present invention is an apparatus for use in drilling operations. It uses an under-reamer having a plurality of elongated arms with cutting elements at the ends of the arms for enlarging a previously drilled borehole drilled by a drill bit. One or more stabilizers in close proximity to the under ...


2
Jewkes Donald, Krueger Volker: Integrated directional under-reamer and stabilizer. Baker Hughes, May 13, 1998: GB2319046-A (10 worldwide citation)

The present invention is an apparatus for use in drilling operations. It uses an under-reamer (10) having a plurality of elongated arms (52) with cutting elements (56) at the ends of the arms for enlarging a previously drilled borehole drilled by a drill bit (34). One or more stabilizers (14,42) in ...